Tonkachi and Renga have big dreams of becoming master builders just like their mentor Shovel, but while Renga can walk the walk, Tonkachi is mostly talk. Nothing Tonkachi builds seems to be worthy of calling a home, but he won’t give up! With the Vigor Hammer that Shovel entrusted to him, Tonkachi plans to work hard to build a peaceful world. But the man Shovel sent to escort the boys into the wider world of building seems to be running a little late…and he lost his pants to a House-Beast on the way!